Contra Costa County property record for 109 Bay St, Hercules, CA 94547
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 1.5 ba · 1,668 sqft · built 1900 |
| Lot Size | 0.129 acres (5,610 sqft) |
| Owner | Individual Name on File |
| Last Sale | $380,000 (Feb 2010) |
| Tax Bill | $8,086 (2025) |
| Deeds & Mortgages | Apr 2024 Mortgage Mar 2021 Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 404-170-015-6 |
| Primary APN | 404-170-015-6 |
|---|---|
| Alternative APN |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 1.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 9 Rooms |
| Stories | 2 Stories |
| Building Area | 1,668 sqft Living Area |
| 1st Floor Area | 854 sqft |
| 2nd Floor Area | 814 sqft |
| Year Built | Built 1900 |
|---|---|
| Effective Year Built | Effective 1985 |
| Exterior Material | Wood Siding |
| Roof Material | Composition Shingle |
| Lot Area | 5,610 sqft (0.129 acres) |
| Lot Dimensions | 102 ft deep x 55 ft wide |
| View / Lot | Bayou |
| Garage Type | Detached |
| Garage Area | 299 sqft |
| Parking Spaces | 1 Parking Space |
| Cooling System | Central |
|---|---|
| Heating System | Forced Air with A/C |
| Heating Fuel | Gas |
| Sewer | Municipal |
| Water Source | Commercial |
| Street Address | 109 BAY ST |
|---|---|
| City | HERCULES |
| State | CA |
| Zip | 94547-3718 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | H |
| Legal Description | T06102 L0015 B |
| Legal Subdivision | SUBDIVISION 6102 |
| Legal Tract | 06102 |
| Legal Lot Number | 15 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | WEST CONTRA COSTA |
| Census Block Group | 1 |
| Census Block | 1000 |
| Census Tract | 359105 |
Source: NPS National Register of Historic Places, as of August 1, 2026
| Historic District | Within the Hercules Village listed 1980 · 40 contributing resources · NRIS 80000799 |
|---|
Federal listing alone does not restrict alterations; local historic district rules, which this data does not cover, may apply.
109 Bay St is owned and occupied by an individual who bought it in February 2010.
Source: Contra Costa County records, as of July 14, 2026
| Owner of Record | Individual Name on File |
|---|---|
| Mailing Address | 109 BAY ST, HERCULES, CA 94547-3718 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Single Person |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Date | Document |
|---|---|
| Apr 24, 2024 | Deed of Trust, Mortgage · Commercial Mortgage PROVIDENT CU |
| Mar 11, 2021 | Deed of Trust, Mortgage · Conventional Mortgage PROVIDENT CU |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Feb 19, 2010 · Amount on File |
| Deed Sale | Feb 19, 2010 · Amount on File |
| Deed Document Number | 201033276 |
| Prior Transfer Date | Apr 19, 2008 |
| Prior Transfer Doc | 0000093363 |
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Property Address | 109 BAY ST, HERCULES, CA 94547-3718 |
| Transaction Type | Mortgage |
| Record Updated | May 3, 2024 |
| Title Company | CHICAGO TITLE PIRT |
| Name | Verified Name |
|---|---|
| Address | 109 BAY ST, HERCULES, CA 94547-3718 |
| Document Number | 0000037948 |
|---|---|
| Date | Apr 24, 2024 |
| Instrument | 2024-037948 |
| Name | PROVIDENT CU |
|---|---|
| Type | Credit Union |
| Address | REDWOOD CITY, CA 94065 |
| Type | Commercial Mortgage |
|---|---|
| Amount | Amount on Record |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Property Address | 109 BAY ST, HERCULES, CA 94547-3718 |
| Transaction Type | Mortgage |
| Record Updated | Nov 3, 2022 |
| Title Company | CHICAGO TITLE |
| Name | Verified Name |
|---|---|
| Address | 109 BAY ST, HERCULES, CA 94547-3718 |
| Document Number | 0000074800 |
|---|---|
| Date | Mar 11, 2021 |
| Instrument | 2021-074800 |
| Name | PROVIDENT CU |
|---|---|
| Type | Credit Union |
| Address | REDWOOD CITY, CA 94065 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 361 Months |
| Due | Apr 1, 2051 |
The 2025 property tax bill for 109 Bay St was $8,086.
Source: Contra Costa County assessment roll, as of July 14, 2026
| Type | Name |
|---|---|
| State | California |
| County | Contra Costa County |
| Municipality | Hercules City |
| Unified School District | West Contra Costa Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $500,305 (+2%) Land $230,402 Building $269,903 | |
| 2025 | $8,086.00 | $490,496 Land $225,885 Building $264,611 |
| 2023 | $7,618.00 (+1.18%) | $471,451 Land $217,114 Building $254,337 |
| 2022 | $7,529.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 109 Bay St in Zone X, an area of minimal flood risk, within 500 ft of a high-risk flood zone.
Source: FEMA National Flood Hazard Layer, effective October 12, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Nearest Special Flood Hazard Area | Zone AE, within 500 ft |
| Flood Insurance Requirement | Not required lenders may require it |
| Nearby Flood Policies | 1 in force |
Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.
The area around 109 Bay St has no burnable land within ember reach, so its wildfire risk is not rated.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Not rated no burnable land within ember reach |
|---|
Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.
Source: EPA Safe Drinking Water Information System, as of September 2026
| Water System | EAST BAY MUD serves 1,468,000 people · EPA ID CA0110005 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Dec 2021 |
| Lead | Under 1 ppb (2022–2024) action level 15 ppb |
| Water Quality | None last 10 years |
|---|---|
| Treatment and Procedure | None last 10 years |
| Monitoring and Reporting | None last 3 years |
Results are for the whole water system, not water tested at this address; lead at the tap also depends on the building's own pipes. This system sells water to local utilities; the supplier billing this address may be one of them.
Source: FCC Broadband Data Collection, based on 505 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 250 |
| Verizon Fixed Wireless | 300 / 20 |
| AT&T Fixed Wireless · DSL | 100 / 20 |
| T-Mobile Fixed Wireless | 100 / 20 |
May also be available: Sonic Telecom, Unwired.
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